
By Rich Powers and Scott Johnston, Vanguard Americas
(Sponsor Content)
The waves of volatility from the coronavirus outbreak have reached every corner of the financial markets. For bond ETFs, the waves have resulted in both volatile market price swings and larger-than-usual gaps between market prices and net asset values (NAVs).
When the gap is positive (that is, when the market price is greater than the NAV), it’s called a premium. A discount occurs when the NAV is greater than the market price. While such gaps can be unsettling, history shows that premiums or discounts are always present with bond ETFs, and their widening amid market volatility tends to be short-lived.
Bond ETFs are an important source of liquidity
Along with heightened market volatility in the bond market over the last few weeks, there’s been a drop in liquidity of many types of individual bonds: that is, the willingness of market participants to buy and sell. Bond ETFs, on the other hand, have maintained their liquidity and have been the primary mechanism for price discovery in the fixed income markets.
In such a volatile environment, bond ETFs can be expected to trade at discounts or premiums. Though discounts and premiums of this breadth and magnitude are rare, bond ETFs have been tested during prior bouts of volatility and actually do a good job of reflecting in real time the value of the underlying fixed income securities. In times of volatility with rapidly evolving macroeconomic, interest rate, and credit environments, investors should expect premiums or discounts in bond ETFs. Bond ETFs tracking similar benchmarks have experienced large variations in market returns as well.
Fewer inputs can create greater price disparities
Discounts and performance differences reflect the fact that there are two ways to determine portfolio values. In setting end-of-day NAVs, ETF pricing specialists use both actual trades and an adjustment factor based on bid/ask spreads for bonds, especially for bonds that haven’t traded recently. Market prices, in contrast, are collectively determined by ETF investors and “market-makers.” If, as happened in the second last week of March, bond trading is fairly diminished in the underlying market, NAV calculations will have fewer inputs and thus there’s an increased chance for differences from market prices.
Unlike a NAV that’s calculated by a pricing provider, market prices for bond ETFs reflect the market’s minute-by-minute judgment, which includes factors such as:
- Valuation estimates of the underlying holdings by market-makers.
- Supply and demand for the ETFs.
- The cost for providing liquidity in fast-moving markets where underlying bonds may have less liquidity.
Since these calculations have different inputs, investors should expect different outcomes, particularly in volatile markets. When viewed over longer periods — say a month or a quarter — these short-term disparities are generally imperceptible, as they are over a “normal” day or week. Continue Reading…







